Spray combustion synthesis of nanocrystalline Y2O3 and its thermodynamical and morphological study

Yao, Gang; Su, Liangbi; Xu, Jing; Xu, Xiaodong; Zheng, Lihe; Cheng, Yan

doi:10.1016/j.jcrysgro.2007.10.032

Cited by 14 publications

(16 citation statements)

References 13 publications

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“…5. A broad band around 3440 cm −1 and weak bands in the range 1500–1650 cm −1 corresponds to OH groups 17 . The distinct peak around 1380 cm −1 is originated from the surface‐absorbed NO 3 − groups.…”

Section: Resultsmentioning

confidence: 96%

“…A broad band around 3440 cm À1 and weak bands in the range 1500-1650 cm À1 corresponds to OH groups. 17 The distinct peak around 1380 cm À1 is originated from the surface-absorbed NO 3 À groups. Reduction in the absorption of these two groups (OH and NO 3 ) is observed with the increase of calcined temperature and disappeared at 14001C, as shown in Fig.…”

Section: (4) Ft-ir Analysismentioning

confidence: 99%

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Greenish‐Yellow Emission from Dy³⁺‐Doped Y₂O₃ Nanophosphors

Jayasimhadri

Ratnam

Jang

et al. 2010

Journal of the American Ceramic Society

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Trivalent dysprosium‐doped cubic yttrium oxide (Y2O3) nanophosphors were prepared by combustion synthesis using glycine as fuel. The resulting products were characterized by Raman and FT‐IR spectra to evaluate the vibrational features of the samples. X‐ray diffraction patterns confirmed the formation of a pure cubic phase of Y2O3. The morphology and selective area electron diffraction measurements were carried out using transmission electron microscopy (TEM) and field‐emission scanning electron microscopy. From TEM, it is observed that as‐prepared particles have average crystallite sizes of around 23 nm. The luminescent and dynamic properties of Y2O3:Dy3+ were examined as a function of temperature and different concentrations of Dy3+. The luminescence study reveals that these phosphors predominantly exhibit greenish‐yellow emission due to strong 4F9/2→6H13/2 transition at 575 nm and a feeble 4F9/2→6H15/2 transition at 488 nm. These results show that the relative luminescence intensity of emission bands changes with different heating temperatures, while the greenish yellow color luminescence as well as Commission International d'Eclairage chromaticity coordinates extracted from the emission spectra were not affected significantly. The strong greenish‐yellow emission of Y2O3:Dy3+ phosphor may be useful for applications in solid‐state white lamps for general illumination purposes.

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Section: Resultsmentioning

confidence: 96%

Section: (4) Ft-ir Analysismentioning

confidence: 99%

Greenish‐Yellow Emission from Dy³⁺‐Doped Y₂O₃ Nanophosphors

Jayasimhadri

Ratnam

Jang

et al. 2010

Journal of the American Ceramic Society

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“…The use of organic material (urea) as fuel during the synthesis Another broad peak near 1638 cm −1 is also due to the bending modes of the hydroxyl group (δ OH ). 29 A broad peak due to the stretching vibration of NO (υ NO ) appears around 1384 cm −1 . The surface adsorbed NO 3 − group is responsible for this quenching entity.…”

Section: Resultsmentioning

confidence: 99%

New Perspective in Garnet Phosphor: Low Temperature Synthesis, Nanostructures, and Observation of Multimodal Luminescence

Mishra

Singh

et al. 2014

Inorg. Chem.

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Herein, we report a new concept for garnet materials in terms of the synthesis of nanocrystalline structure at low temperatures and its multimodal luminescence processes. Terbium- and ytterbium-ion-codoped yttrium gallium garnet nanophosphors have been synthesized via solution combustion technique; nearly pure phase nanophosphor samples were obtained. The synthesized nanophosphor shows efficient multimodal upconversion (UC), downshifting (DS), and quantum cutting (QC)/downconversion (DC) luminescence, which is a new paradigm in garnet material. The garnet nanophosphor shows strong green emission through DS and UC processes both. Furthermore, cooperative energy transfer (CET) has been described in detail, and a possible mechanism for the QC process is also proposed. A UV/blue photon absorbed by Tb(3+) ion splits into two near-infrared photons (wavelength range 900-1040 nm), emitted by a Yb(3+) ion pair, with an efficiency of more than 100%. The Yb(3+) concentration dependent ET from Tb(3+) to Yb(3+) has been verified using time domain analysis. An ET efficiency as high as 28% and a corresponding QC efficiency of about 128% (for 15 mol % of Yb(3+) concentration) have been attained. Such a multimode emitting nanophosphor could be very useful in display devices and for enhancing the conversion efficiency of next generation solar cells via spectral modification etc.

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“…During the calcination procedure, most of the particles aggregated into these large-size particles (tens or hundreds of nanometers). This may be due to the strong interactions among the nanoparticles due to their high surface energy [27].…”

Section: Xrd Pattern and Electronic Microscopy Characterizationmentioning

confidence: 99%